On Fri, 2 Apr 2004, Jonathan Woithe wrote:
> Thanks for your reply.
You're welcome - hope it was of some (little) use.
> By "the motion" here I assume you're talking about the switch between two
> nominally black noise fields? In my case I have black on both sides of the
> join. In fact, the spike in bitrate occurs even if I have two totally black
Oh, I misunderstood (or mis-read ;)) your initial report to mean
you were jumping from black to full scene.
The spike/glitch you're seeing is almost certainly caused by the
timestamp discontinuity at the splice point.
> That sounds like a good solution - I still have the individual m2v and mp2
> files. I would be willing to write a quick-and-dirty program/script to do
And as another chap mentioned - there's the "mpgjoin" program
from mpgtx.sourceforge.net that might do what you want.
> this since it would solve my immediate problem. However, I need some info:
> where can I find a concise reference to the file format used for the m2v and
> mp2 files? I'm guessing that the process is essentially to rip off a
The ISO specs? ;) Or the sources to mplex/mpeg2enc/libmpeg2 ;)
> It would also be good to have a way of finding out how long each m2v file
> was. In particular I'd like to spit out the time length of each m2v so I
> can use this info to make chapter marks in dvdauthor later on.
Or better yet a GUI program with a sliderbar that you could move
thru the video and place chapter points (something like what
DVD Studio Pro does :)).
> > I've shown how to arrange for a continuous YUV4MPEG2 feed into the
>
> Sure. However, due to the speed of my CPU I'd rather not go though the
> rendering/encoding process again and besides, the rendering came out of
I wasn't thinking of this particular encoding run but rather of
future ones. A long time ago I found it saved a lot of grief
later by arranging for a continuous feed of Y4M data into the
encoder.
Of course if you're creating a DVD with multiple tracks/titlesets
then each of those can use a separate .mpg file without a problem - it's
only the joining together into a single title/track that seems to
have problems.
> cinelerra. If I could get enough info to cobble together "m2vcat" and
> "mp2cat" scripts/programs that would be fine - rerunning the multiplexer
> isn't a major issue.
mpgjoin will deal with the video. For the audio I don't know of a
way to join mp2 files together. Audio rendering is a lot faster
than video - so perhaps creating the sound again as a single file
might be a good idea
Cheers,
Steven Schultz
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